Biological contact oxidation process is a biological magic process between
activated sludge process and biological pond, which is characterized by setting
fillers in the pond, aerating the bottom of the pond to fill the sewage, and
making the sewage in the pond in a flowing state, so as to ensure full contact
between the sewage and the fillers in the sewage and avoid the defect of uneven
contact between the sewage and the fillers in the biological contact oxidation
pond. The basic principle of purifying wastewater is the same as that of general
biofilm process, which uses biological adsorption of organic matter in
wastewater.